I have a "Y" variable with many values less than 50, and many fewer 
between 50 and 250.I'd like to plot those Y's against an X, with two 
scales on the Y axis---maybe 60% of the axis height for 0-50 and the top 
40% for 50-250.(I can't use log(Y) because there are many zeroes, and 
that is the most desirable value.)

I think I've seen plots done that way, but is there a way to create them 
in R?

Thanks for any help.


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